-LRB- CNN -RRB- -- A preliminary autopsy Thursday did not reveal any identifying information on remains found on the bank of a river , less than 30 miles from the homes of two missing Illinois women .

Partial skeletal remains were found on the south bank of the Des Plaines River near Channahon , Illinois .

The `` partial skeletal remains '' were found on the south bank of the Des Plaines River near Channahon , Illinois , according to Will County Coroner Patrick O'Neil 's office .

A statement issued by O'Neil 's office said a forensic examination was inconclusive as to identity , race or sex of the body parts , which consisted of a rib cage , spinal column and partial left and right femur bones .

A marine cleanup crew , which discovered the remains Wednesday , also found shreds of blue jeans and a small amount of money .

The Illinois State Police Forensic Crime Laboratory is expediting a DNA analysis , which will take at least two weeks , the statement said .

Illinois State Police were on the scene Thursday conducting additional searches , said spokesman Sgt. Tom Burek .

On Sunday , Michelle Williams found a blue barrel in Channahon , Illinois , along the river and called police . Watch Williams describe her grisly find ''

Channahon is 20 miles from Bolingbrook , Illinois , where Stacy Peterson lived with her husband , former police officer Drew Peterson . The former officer 's stepbrother told police he helped Drew Peterson move a heavy blue barrel shortly after his wife 's disappearance police uncover skeletal remains ''

Williams said she did n't initially make any connection regarding the barrel , but she did call police .

`` It was n't until yesterday afternoon when the news broke that there had been skeletal remains washing up on shore and that far away from the blue barrel , I had a sick feeling to my stomach when I heard that , '' Williams told CNN 's Nancy Grace .

Stacy Peterson disappeared in October 2007 . Her husband has been named a suspect in her disappearance , but he has maintained his innocence , saying she left him for another man .

Stacy Peterson , 23 when she was last seen , was Drew Peterson 's fourth wife . This month , Drew Peterson , 55 , was indicted on murder charges in the 2004 death of his third wife , Kathleen Savio , while the two were in the midst of a nasty divorce . He has pleaded not guilty .

Savio 's death was originally deemed an accident , but authorities took a second look at the case after Stacy Peterson 's disappearance .

Channahon is also 15 miles from Plainfield , Illinois , where Lisa Stebic was last seen in April 2007 .

On the day she went missing , she petitioned a court to have her husband , Craig , evicted from their Plainfield home . Craig Stebic told police he was working in the backyard when his 37-year-old wife left home about 6 p.m. , taking her cell phone and purse .

Authorities have said they believe that Lisa Stebic was the victim of foul play and have named Craig Stebic a suspect .

CNN 's Kara Devlin contributed to this report .

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NEW : Rib cage , spinal column and partial left femur bones among body parts found

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NEW : Autopsy inconclusive as to identity of remains ; DNA testing to take two weeks

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Remains found on south bank of Des Plaines River

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Area is near homes of Stacy Peterson , Lisa Stebic